Cylinder-rolling mill.



PATENTED NOV. 13, 1906.

H. EHRHARDT.

CYLINDER ROLLING MILL.

APPLICATION FILED MAR. 4, 1902.

2 SHEETS-SHEET l 5i: ail-Er E55 0 \NEN'I'U F\ I '04 KTFEIFKNE. s

WIT ESE ES PATENTED NOV. 13, 1906.

H. EHHHARDT.

CYLINDER ROLLING MILL.

APPLICATION FILED MARA, 1902.

2 SHEETS-SHEET Zv WTBN E nrirrnn sirnrns lPAT-ENT @FFKOE @YLlNDEFPQQLLlNG pecification of Letters ,ZPatented Nov. is, race;

Application filed March 4, 1902. Serial No. 96,584.

To all whom it may concern:

Be it known that l, Hnmnron EHRHARDE, engineer, a subject of the German Emperor, residing at 20 Reichstrasse, Diisseldorffin the Empire of Germany, have invented new and useful improvements in Cylinder Rolling Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a rolling-mill for rolling seamless hollow cylinders of large diameter; and it consists in the arrangement of the rollers so that the up er one may be withdrawn for introducing t h lower one may be adjusted during the rolling o eration. Guide-rollers for the blank are a so provided and may be adjusted to the increasing diameter of the cylinder.

In the accompanying drawings, Figure 1 is a longitudinal vertical section through a mill constructed according to the invention showing a part in elevation. Fig. 2 is an end elevation partly in section. Fig. 3 is a similar view with parts of the mechanism removed, and Fig. 4 is a diagrammatic section through the blank and the rollers.

- As shown in Fig; l, theupper roller a is journaled in the standards I) and c in such a manner that it can be withdrawn in the direction of its axis in order that the blank may be placed in position on the lower roller d and the guide-rollers e eff. For this purpose the u per roller (1 is connected with a rod 4 fastene to the piston-rod hof .a hydraulic cylinder. By forcing the piston ofthe hy-' draulic cylinder by means of hydrauliopressure in a well-known mannerto the right, the upper roller a will be withdrawn from the standards I) and 0.. Then the blank g, Fig. 2, is placed on the lower roller d and the guide-rollers e e f f, whereupon the upper roller a is replaced into its standards by passing it through the hollow blank g, Fig. 2.

. The bearings of the lower roller (1 are supported on screw-spindles 7c in such a manner that they may be adjusted to ress the lower roller against the blank, an at the same time they are adapted to slide in a direction normal to the axis of the rollers a and b. For exerting the actual pressure on the blank without involving thescrew-friction of the spindles, the latter are supported by hydraulic presses n, which exert the necessary pressure, but only to an extent determined e blank and the of the roller, two axial the hydraulic press to the other bearing by the adjustment of the screw-spindles. in order that the pressure shall always be the same at each end of the roller,,each spindle is carries a pinion Z, engaging with a toothed rack m, which is 'moved by any suitable mechanism. By this arrangement the adjustment of each spindle is the same. Any other of the known methods for making a driving connection between two shafts may of course besubstituted for the rack and pinions.

Difierences the thickness of the wall of the cylinder that is -being rolled caused, for instance, by the bendin of one of the rollers, particularly the lig ter upper one, are avoided by mounting the lower'roller so that it can swing in a horizontal plane obliquely to the upper roller. The axis on which this turning occurs maybe either the vertical line bisecting the length of the roller, so that the latter become closer together at their middle one end of the lower roller. The arrangement for this purpose is more particularly shown in Fig. 3. The bearings 0 of the lower roller d can be shifted in the frame of the machine indirections at right angles to the axis y-sliding pins p, one on each side of the bearing, being provided for the urposei 1 i T e piston of a hydraulic press g, fastened to the stand of the machine, as shown in Figs. 1 and 3 has a cross-head rlinked to an arm 8. on rocking shaft t. I A secondar'm u on the latter is linked by arod o with an arm to of a lever, which has a second arm a: bearing against the end of the" in '1). By raising the piston of the press g t e lever a; is caused ,to push the pin p to the right and at the same time the movement is transmitted by am y,

rod z,andlevers y u v w similar to those just described, to lever in, which is thus shifted also to the right to allow of a like movement of pin 1) on'that side of the hearing 0. Therocking shafts tt extend to the other end of the machine, where by a like system of levers they transmit the motionof of the-lower roller; but here the movement is in the-opposite direction. If the lower roller is toswing about an axis passing through one of its ends, the hearing at that end is fixed and the ins p at the same end are removed,

so that t e levers a: so at this side of the ma-' chine cannot aflect the roller-bearingi'tw J Referring to Fig. 2, the arrangement for increasing diameter of the cylinder comprises guides 2and 3, in which the bearings oi rollers e and f respectively slide, movement being imparted to them by a system of levers and a hydraulic press 4. By raising this press two rock-shafts 5 are rocked by means:

of links 6, Fig. 2, connected with the pistonrod of the press 4 and attached to arms 7, fastened on the rock-shafts 5. 'lhozmovement of this rock-shaft isirnparted by means oi arms 8 and 9 and by means oi holes 10 and 11 totheiollers e and f, so that by raising the press at the rollers 'e and y are shifted outward in their guides to allow the cylinders o more room.

Having now particularly described and ascertained the nature oi my said invention and in What manner the some is to be performed, l, declare that What I claim isl. in a cylinder-rolling mill, the combination oi a cylindrical roll adapted to support the cylinder to rolledand to operate upon the exterior surface thereof, a second cylin di'icalroll adapted to operate upon theinterior oi the cylinder to be rolled, the operative portions oi each roll being of uniform cross section and of such length as to extend throughout the entire length of the cylinder, means for adjusting one end oi the supporting-roll laterally so that said supportingroll Wi I extend obliquely to the interior roll, and means for holding said exteiior roll in its adjusted position.

2. in a cylinder-rolling mill, the combination oi a cylindrical roll adapted to support the cylinder to be rolled and to operate upon the exterior surface thereof, a second cylindrical roll adapted to operate upon the inte- Elf)? of the cylinder to be rolled, the operative portions of each roll being of uniform crossscction and of such length as to extend throughofit the entire length of the cylinder,

means for adjusting both ends of the supporting-rolll-aterally, but in opposite directions, so that said roll Will extend obliquely to the interior roll, and means for holding the supporting-roll in its adjusted position.

3. in a cylinder-rolling mill, the combina tion of a roll adapted to support the cylinder to be rolled and to operate on the exterior surface thereof, a second roll adapted to act on the interior of the cylinder to be rolled, the operative portion of each roll being 0i uniform diameter throughout its length and adapted to extend throughout the cylinder to be rolled, means for adjusting laterally the exterior, supporting, roll so that said supporting-roll Will extend obliquely to the interior roll, and means for holding said exteri-or, supporting, roll in its adjusted position.

4. in a cylinder-rolling mill, the combina tion of a roll adapted to act on one surface of a tubular blank, a second roll adapted to .o crate on the other surface of said blank, t e

to can operative portion of each of said rollsbeing oi the same diameter throughout its length, means for adjusting one of said rolls laterally it to extend obliquely to the other roll, and means for holding said movable roll in its adjusted position.

5. In a cylinder-rolling mill, the combination of a roll for acting on the interior of a \cylinder, a roll for acting on the exterior of a cylinder, pins or rods arranged on osite sides of a bearing of the exterior rig, and means for adjusting said pins or rods longitudinally to said bearing of the exterior roll laterally.

c. iii a cylindenrolling mill, the combination with a toll, oi a laterali --sliding beai'in supporting one end oi the rollfleyers arranged on opposite sides of said sliding bearing, means i012 simultaneously rocliing said lovers in opposite directions, and means for transmitting the motion of said lovers to said bearing.

7. in a cylinder-rolling mill, the combination oi a roll for acting on the interior of a cylinder, a roll for acting on the outer surface of a cylinder, the be oi said outer roll being adjustable both vertically and laterally, hydraulic devices for adjusting said beatings laterally, and inde .endont hydraulic devices for ad lusting said bearings vertically.

8.- n a cylinder-rolling will the combination of a roll for action on the interior of a cylinder, another will for acting on the exterior of a cylinder, means for adjusting both ends of the second roll laterally in op site directions, means for retaining said r0 in its. adjusted position, a pair of hy-' draulic cylinders, longitudinally-adjustable connections between the bearings of said exterior roll and plungers in said c linders, and positively movable connections etWeen said plungers, whereby the exterior roll can be adjusted toward or from the interior roll and the extent of such adjustment can be he t equal on both ends of theroll independent y of any variation in the stroke of the plungers oi the hydraulic cylinders.

Ina cylinder-rolling mill, the combination of a roll for acting on the interiorof a cylinder, a second roll for acting on the exterior of a cylinder, guides arranged on on 0- site sides of and above the exterior roll? a plurality of supplemental rolls mounted in said guides and acting With said exterior roll to so port the cylinder being rolled, two

roclcs afts arranged on opposite sides of said main rolls and each connected With the adjacent supplemental roll, and a ower device adapted to simultaneously rec; both said horizontal 'des arranged on opposite sides I vice adapted to simultaneously rock said 10 of said rolls? oppositely-inclined guides arshafts to adjust the supplemental rolls as deranged above said horizontal 'des, supplesired.

mental rolls mounted in guide: and acting In witness whereof I have hereunto set with said exterior roll to support the cylinder I my handin presence of two witnesses.

being rolled, rock-shafts arranged on opposite HEINRICH EHRHARDT. sides of the main roll and each connected Witnesses:

with supplemental rolls in the adjacent hori- PETER LIEBER, zontal and inclined guides, and a power de- WILLIAM ESSENWEIN. 

